Rusty- the "voltage boosters" you're talking about are known in the industry as DC-to-DC converters, such as I bought from Antique Electronic Supply. To buy one with enough output current capacity to directly run a sound system would be very expensive. A "junk" 12v battery serves as a perfect "buffer" (capable of many, many amperes and is basically "free"), so the converter only needs to supply the average current consumed and can be inexpensive. Have fun!
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Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?(back in 1967)
... or has a Pontiac born the same year as Jim Wangers? (1926} 
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